A traveling wave train has wavelength 0.400 m, speed 35.0 m/s. Find the wave frequency
a. 0.0114 Hz
b. 43.8 Hz
c. 87.5 Hz
d. 21.9 Hz
e. 55.3 Hz
c
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We know the Sun is primarily made from hydrogen and helium on the basis of its
A) luminosity. B) spectrum. C) age. D) color. E) mass.
The sub-atomic particle known as the "neutrino" was originally hypothesized
A) because it was thought that radiant energy is actually a form of energy. B) in order to preserve conservation of electric charge in a certain type of nuclear process. C) in order to preserve Newton's laws in a certain type of nuclear process. D) because it was thought that thermal energy (or heat) is actually a form of energy. E) in order to preserve the law of conservation of energy in a certain type of nuclear process.
A laboratory in space has a window so an experiment can be observed from outside. The apparatus has two light sources, red at one end and blue at the other, that can be switched on at the same time. When the light from either source reaches a detector at the midpoint between the sources, a detector light comes on that is red if the red light reaches it first, that is blue if the blue light
reaches first, and is white if both the red and reach the detector at the same time. The experimenter triggers both the blue and the red light sources at the same time, and as a result the white light signals their simultaneous arrival. An observer traveling in a spacecraft at high speed in a direction parallel to the length of the apparatus so as to pass the detector as it turns on during the experiment. What color light does the observer see coming through the window from the detector? a. red b. white c. blue d. This requires the length of the apparatus and observer's speed to answer.
A 5.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, ?4.0) m. What is the moment of inertia of this system of masses about the x axis?
a. 280 kg·m2 b. 33 kg·m2 c. 176 kg·m2 d. 99 kg·m2 e. 44 kg·m2